Question on Pinpoint PH Controller Probe Replacement

[Snook65]

My Pinpoint PH Controller, which I've had for 6-7 years, started giving very low readings. I figured the probe needed to be replaced as I was unable to calibrate the existing one. I went to a LFS, which is actually over an hour away but I prefer to give them my business, and was sold a Milwaukee replacement probe. I got home and it did not read, nor calibrate, properly either. I then figured my PH Controller was the culprit. I took the probe back to the store to see if they would give me a credit and the owner saw that they gave me an ORP probe by mistake. They gave me a new probe and sent me on my merry way. I just tried to calibrate the new probe and it will not calibrate. I looked at the end of the probe and it has a tiny metal pin coming out of it, where the Pinpoint probe has a glass bulb. The new probe has "MA 921" written on the top, and after Googling it, this seems to be an ORP probe as well. Can anyone confirm that I still have not been given a PH probe? Thanks.

 

[DaveMorris]

A probe labeled "MA 921" is in fact an ORP probe. It should clearly say on the probe that it is a ph probe. This will be silk screened on the probe body, printed on the white label near the connector, or both. Sounds to me like the LFS needs to have a better handle on their inventory. I have also never seen a ph probe that does not encapsulate the probe tip in a bubble of glass or plastic.

 

[Snook65]

DaveMorris, thanks for the confirmation. As mentioned, the only writing on the probe is up near the top, where the wire is attached, and it only says MA 921. I will get with the store on Monday.